Calculate the mass of a lorry that has a momentum of 4600 kg m/s and a velocity of 15m/s. Give your answer to two decimal places

It is claimed that if a lead bullet goes fast enough, it can melt completely when it comes to a halt suddenly, and all its kinet

TEA [102]

Answer:

$v=346.05\ m.s^{-1}$

Explanation:

Given:

initial temperature of the lead bullet, $T_i=43^{\circ}C$

latent heat of fusion of lead, $L_f=2.32\times 10^4\ J.kg^{-1}$

melting point of lead, $T_m=327.3^{\circ}C$

We have:

specific heat capacity of lead, $c=129\ J.kg^{-1}.K^{-1}$

According to question the whole kinetic energy gets converted into heat which establishes the relation:

$\rm KE=(heat\ of\ rising\ the\ temperature\ from\ 43\ to\ 327.3\ degree\ C)+(heat\ of\ melting)$

$\frac{1}{2} m.v^2=m.c.\Delta T+m.L_f$

$\frac{1}{2} m.v^2=m(c.\Delta T+L_f)$

$\frac{v^2}{2} =129\times(327.3-43)+23200$

$v=346.05\ m.s^{-1}$

3 0

3 years ago

What is the public storm warning signal that carries winds of 30 to 60 km/hr and can cause no damage to very light damage

Shkiper50 [21]

Answer:

I know u need this

Explanation:

You gave me the runaround

I really hate the runaround

You really got me paranoid

I always keep a gun around

You always give me butterflies

When you come around

7 0

3 years ago

What is blood ? Name its components

Bas_tet [7]

Plasma, red blood cells, white blood cells, and platelets.

3 0

3 years ago

___ energy has a slightly longer wavelength than visible light energy and can be felt to the touch

ladessa [460]

Infra-red radiation has a slightly longer wavelength than red light ...
the longest wavelength that is visible to the human eye.

Although infrared can't be detected by the eye, we do have other
receptors that CAN detect it. They are some of the nerve endings
in our skin. When infrared radiation hits these, it produces the feeling
of warmth. Infrared radiation carries heat energy.

3 0

4 years ago

The average kinetic energy of the atoms that make up a substance which is changing from a liquid to a solid is _____________.

inysia [295]

The average kinetic energy of the atoms that make up a substance which is changing from a liquid to a solid is decreasing. The answer is letter A. This is because there is more room for movement of atoms if the pahse is in liquid than in solid.

4 0

3 years ago